Over a week ago we had something about magnetars having a solid surface. Magnetars are a subset of pulsars are a subset of neutron-stars. I didn't pay much attention to the article; I didn't know what questions it answered, nor if if I should quest after the questions.
We do know that magnetars are fairly Big Deals. As of December 2020 they numbered 24-30. It's a hypefest when we hear of a 31st - or of a a 32nd in-making.
Today we got that question: models on neutron-star composition, based on mass. If over 1.7 solar masses, the noot has a hard surface; if under - like ZTF J1901+1458 is becoming - its surface is soft.
So magnetar masses, I think, trend over 1.7 M☉. And aren't accreted gradually.
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